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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) on operations | $ 690 | $ 3,467 | $ 3,820 | $ 3,233 | $ (6,036) | $ 3,809 | $ 5,189 | $ 4,571 | $ 11,210 | $ 7,533 | $ (36,389)
Effective income tax rate |  |  |  |  |  |  |  |  | 17.20% | 14.30% | (92.80%)
Unremitted earnings of foreign subsidiaries | 55,707 |  |  |  |  |  |  |  | $ 55,707 |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  |  |  |  |  |  |  |  | $ (15,269) |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  |  |  |  |  |  |  |  |  | 6,207 |
Income tax expense (benefit) due to Tax Cuts and Jobs Act | 710 | $ (131) |  |  |  |  |  |  |  | $ (9,062) |
General business tax credit carry forwards, expiration date |  |  |  |  |  |  |  |  |  | Dec. 31, 2024 |
Reduction of noncurrent deferred tax asset |  |  |  |  |  |  |  |  |  | $ (15,269) |
Liability for uncertain tax positions reduction to noncurrent asset | 3,449 |  |  |  |  |  |  |  | 3,449 |  |
Liability for uncertain tax positions, noncurrent | 32 |  |  |  |  |  |  |  | 32 |  |
Unrecognized tax benefits that would impact effective tax rate | 3,481 |  |  |  | 3,645 |  |  |  | 3,481 | 3,645 |
Gross interest and penalties expense (benefit) |  |  |  |  |  |  |  |  | (13) | (33) | $ (59)
Accrued payment of interest and penalties | 19 |  |  |  | $ 32 |  |  |  | 19 | 32 |
Impairment of Goodwill |  |  |  |  |  |  |  |  | 0 | $ 0 | $ 0
State and Local Jurisdiction [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carry forwards | 64,189 |  |  |  |  |  |  |  | 64,189 |  |
General business and foreign tax credit carry forwards | 1,493 |  |  |  |  |  |  |  | 1,493 |  |
Foreign Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carry forwards | 24,745 |  |  |  |  |  |  |  | 24,745 |  |
General business and foreign tax credit carry forwards | 1,324 |  |  |  |  |  |  |  | 1,324 |  |
U.S. Federal [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
General business and foreign tax credit carry forwards | $ 23,404 |  |  |  |  |  |  |  | $ 23,404 |  |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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